Boiler-pressure regulator.



l. A. BACKLUND.

BOILER PRESSURE REGULATOR.

APPLICATION FILED AUG.27, I914.

1 1 99,726 Patented Sept. 26, 1916.

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IsAAo ALFRED BACKLUND, or SEATTLE, WASHINGTON.

BOILER-PRESSURE REGULATOR.

messes.

Specification of Letters Patent. Patented $61M]. 26, 1916.

Application filed August 27, 1914. Serial No. 858,923.

T all whom it may concern:

Be it known that I, IsAAo ALFRED BACK- LUND, a citizen of the United States, residing at Seattle, in the county of King and State of Washington, have-invented certain new and useful Improvements in Boiler- Pressure Regulators, of which the following is a specification.

This invention relates to regulators for steam generators and is in the nature of an improvement on the devices of this class illustrated and described in United States Patents 1,032,176, dated July 9, 1912, and 1,068,295, dated July 23, 1913, which were issued to me.

The object of my improvements is the perfecting of a regulator for steam generators to better control the action of the same by promoting or retarding the generation of steam by regulating the draft doors or dampers thereof or by regulating the supply of fuel where a fluid combustible is used. To which ends, the invention consists in the employment of a vertically movable liquid receptacle which is operatively connected with the dampers or doors of a boiler, said receptacle being in the present invention in fluenced by the quantity of liquid which is supplied thereto from a tank through the agency of the pressure of steam obtaining within the boiler.

The invention further consists in the novel construction, adaptation and combination of parts as will be hereinafter described and claimed.

The accompanying drawing illustrates in front elevation a steam boiler with the improved regulator applied thereto and shown nected by a pipe 9 with the upper end of said water column and thence by the aforesaid pipe 6 with the steamspace within the boiler; The tank 8 is supplied with a liquid such as mercury or water and, where the latter is used, it is most convenientlyobtained from the water column through a branch 9 of pipe 9. A shut ofi valve 10 is provided in the water supply pipe 9 and is thereby closed after a predetermined amount of water is supplied to the tank and remains closed during the operating of the apparatus. r

I 11 is a pet cock, provided for the tank to withdraw therefrom surplus water due to the condensation of steam which'if not removed would materially lessen the value of the apparatus by disturbing the adjustments of the same. 12 represents a pipe communicating with the lower end of said tank and is connected by a flexible tube 13 with a pipe 14 rigidly secured to a liquid receptacle 15. The pipe 14 has outlets 14 afiordingcommunication with the interior of the receptacle. The pipe 14 is advantageously extended, as at 14 a distance above said receptac'le and its upper end opens into the exa stud 18 whereby it is pivotally connected .to the arm 19 of a bell crank lever whose other arm 19 is connected by a chain 20 with an arm 21 secured to the spindle22 upon which the damper 4 is mounted. 23 represents a weight carried by an arm 23 of said spindle and tends to rotate the damper into its open position.

24 represents the connection of an oil burner extending into the boiler furnace and is connected to steam and oil supply pipes 25 and 26 which are respectively provided with regulating valves, indicated by 25 and 26 Said valves are provided with lever handles 25 and 26 which are connected by a wire cord, 27 or an equivalent, to a rod 28 mounted for reciprocatory movements onrollers 29. One end of rod 28 is connected by a cord 30 with a spring 31, and

ice 7 the other end of the rod is'connected' bywa cord 32 with an'arm 33 provided on a shaft 34 to which the bell crank 1919 is keyed V or otherwise secured' Provided on the spindle 22 is an arm 35 which is connected from its free end by a cord 36 with an attachment 37 secured to the draft door 2.

and 32 represent guide rollers to suitably lead the cords 30 and 32 to the rod 28.

38 is a valve for the pipe 9 and is employed only when the regulator is to be rendered inoperative as, for example, when supplying liquid to the tank 8.

39 denotes a-gage glass connected to pipe 14 and the extension 14 for indicating the height of the liquid within the receptacle 15 at various boiler pressures for the purpose of adjusting the elevation of the receptacle with respect to the tank 8 and subject to the quantity and nature of the liquid which is utilized. 7

The above described devices constitute a complete apparatus for accomplishing the regulation of the steam pressure generated within the boiler. The operation thereof may be explained as follows: With the tank 8 supplied with water, for example, up to the level indicated by broken line A when the pressure within the boiler is approximately the same as atmospheric pressure, the valve 10 is closed. The weight 23 acting counter to that of the door 2 and of the receptacle 15 and its attachments will hold the former open and the receptacle in its most elevated position as determined by a pin 16 encountering the guide 17. The damper 4 will likewise be in open position as will also the steam and oil valves 25 and 26 When steam is generated in the boiler it will flow through pipe 6 to the column 5 and thence by pipe 9 into the tank above the contained liquid. As the steam pressure is increased it will act against the liquid surface to cause the liquid to be forced down in the tank and ascend in the pipes 12 and 13 into the receptacle 15 until the weight of the liquid in the latter is suficient to overcome the power of the weight 23 and of the spring 31, whereupon the receptacle descends with a corresponding movement of the rod 16, until intercepted by the pin 16 above the guide 17 engaging the same. As this movement of the receptacle occurs the arm 19 is similarly affected resulting in the shaft 34 turning to influence the arms 19 and 33 to impart closing movements to the damper, the draft door and the explain. 7

Interposed in the pipe 40 is a gate valve 41 having the stem 41 of the valve proper connected to a lever 42 which is fulcrumed at 43 and, as shown, is connected at its free end to a spring 44 and a weight 45 which tend tomaintain the valve in its open position. The lever 42 supports by a rod 46 a sheave 47 over which is a cord 48 suspend ing at one end the receptacle 15 and has its other end connected to a chain 49 arranged to have selected of its links caught on a hook 49 which is shown as attached to the pipe 9 which conducts steam from the pipe 40, at the delivery side of the valve 41, to the tank 8?. The receptacle 15 is connected by a tube 13 with thetank.

In operation, the liquid supplied to the tank is forced by excessive steam pressure at the delivery side of the valve 41 up into the receptacle 15* to cause it to descend thereby closing the valve 41 with a corresponding reduction in the delivered steam pressure.

Adjusting the height of the receptacle regulates the steam pressure by throttling the same at the valve.

v It is to be noted that the action of the apparatus is dependent upon the pressure of steam on a body of liquid and in accordance with the difference in altitude of such a body and that of the receptacle wherein the weight of liquid is utilized as the governing agent, and is in no way dependent or affected by the height of water in the boiler.

Vfhat I claim, is

In apparatus of the class described, the combination with a steam generator, and a draft controlling damper therefor, of a tank subjacent to the generator, pipe connections between the upper end of the tank and with the generator both above and below the water level therein, valves in said connections for predeterminately cutting off communication of the tank with either the water or steam spaces of the generator, vertically movable water receptacle positioned above said tank, operative connections between the receptacle and said damper, a pipe including a flexible member con necting said receptacle with the lower end of the tank, a rod depending from the receptacle, a guide for said rod, and means carried by the rod and coacting with said guide for limiting the vertical movements of the receptacle, ubstantially as and for the purposes specified.

Signed at Seattle, Vvashington, this 7th day of August, 1914.

ISAAC ALFRED BAGKLUND.

Witnesses:

PIERRE BARNES, MABEL BROWN.

Gopien of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

Washington, D. G. 

